Which potentiometer tool to adjust VR6 AM power on a Cobra 142 GTL.

[snippits75]

Just picked up a cherry Cobra 142 GTL. Radio is stock no mods. Dead key is 1.5 watts, and it is swinging about 10 watts true PEP.

Need to raise the carrier to 2.5 to 3 watts. Which good quality tool do I need to buy to adjust VR6 to raise AM carrier?

Thanks!